[(2a+b)(2a+b)+(2a+b(b-2a)-6b]/2b a=-1/2 b=3
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[(2a+b)(2a+b)+(2a+b(b-2a)-6b]/2b a=-1/2 b=3
[(2a+b)(2a+b)+(2a+b(b-2a)-6b]/2b a=-1/2 b=3
[(2a+b)(2a+b)+(2a+b(b-2a)-6b]/2b a=-1/2 b=3
[(2a+b)(2a+b)+(2a+b(b-2a)-6b]/2b =[(2a+b)(2a+b+b-2a)-6b]/2b
=2a+b-3=2*(-1/2)+3-3=-1
原式=(4a²+4ab+b²+b²-4a²-6b)/2b=b-2a+3=8
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